Well, Code, once more you are trotting out the lie. No, scientists did not predict an ice age in 1975.
Did scientists predict an impending ice age in the 1970s?
"The media had been spreading warnings of a cooling period since the 1950s, but those alarms grew louder in the 1970s. In 1975, cooling went from 'one of the most important problems' to a first-place tie for 'death and misery'. The claims of global catastrophe were remarkably similar to what the media deliver now about global warming." (Fire and Ice).
What the science says...
1970s ice age predictions were predominantly media based. The majority of peer reviewed research at the time predicted warming due to increasing CO2.
What was the scientific consensus in the 1970s regarding future climate? The most cited example of 1970s cooling predictions is a 1975 Newsweek article "The Cooling World" that suggested cooling "may portend a drastic decline for food production":
"Meteorologists disagree about the cause and extent of the cooling trendÂ… But they are almost unanimous in the view that the trend will reduce agricultural productivity for the rest of the century."
A 1974 Times Magazine article Another Ice Age? painted a similarly bleak picture:
"When meteorologists take an average of temperatures around the globe, they find that the atmosphere has been growing gradually cooler for the past three decades. The trend shows no indication of reversing. Climatological Cassandras are becoming increasingly apprehensive, for the weather aberrations they are studying may be the harbinger of another ice age."
However, these are media articles, not scientific studies. A survey of peer reviewed scientific papers from 1965 to 1979 show that few papers predicted global cooling (7 in total). Significantly more papers (42 in total) predicted global warming (Peterson 2008). The large majority of climate research in the 1970s predicted the Earth would warm as a consequence of CO2. Rather than 1970s scientists predicting cooling, the opposite is the case.